These decks all want to attack relentlessly, so cards that reward you for attacking and dealing combat damage are important to let you impact the midgame
Commanders like Runo Stromkirk and Serpent of Yawning Depths want you to play big sea monsters and even synergize with them, while cards like Whelming Wave reward you for playing them
However, the rarest of the rare are called immersive cards, which will play a specialized animation that takes you into the illustration to play out an entire Pokmon scene
The craziest piece is probably an Excellent Shivan Dragon, if we are not counting the Beta Mox Pearl from before
On top of transforming your entire pack, you Fog every non-Wolf and non-Werewolf creature, allowing you to attack or block favorably into opposing creatures
Focus on what your deck wants to do and determine how many creatures or spells to include based on that